strlcat.c

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    1 /*      $NetBSD: strlcat.c,v 1.2 2003/05/15 15:02:52 itojun Exp $       */
    2 /*      $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $    */
    3 
    4 /*
    5  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    6  *
    7  * Permission to use, copy, modify, and distribute this software for any
    8  * purpose with or without fee is hereby granted, provided that the above
    9  * copyright notice and this permission notice appear in all copies.
   10  *
   11  * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
   12  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   13  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
   14  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   16  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   17  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18  */
   19 
   20 #include <sys/cdefs.h>
   21 #if defined(LIBC_SCCS) && !defined(lint)
   22 __RCSID("$NetBSD: strlcat.c,v 1.2 2003/05/15 15:02:52 itojun Exp $");
   23 #endif /* LIBC_SCCS and not lint */
   24 
   25 #include <sys/param.h>
   26 #include <lib/libkern/libkern.h>
   27 
   28 /*
   29  * Appends src to string dst of size siz (unlike strncat, siz is the
   30  * full size of dst, not space left).  At most siz-1 characters
   31  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
   32  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
   33  * If retval >= siz, truncation occurred.
   34  */
   35 size_t
   36 strlcat(dst, src, siz)
   37         char *dst;
   38         const char *src;
   39         size_t siz;
   40 {
   41         char *d = dst;
   42         const char *s = src;
   43         size_t n = siz;
   44         size_t dlen;
   45 
   46         /* Find the end of dst and adjust bytes left but don't go past end */
   47         while (n-- != 0 && *d != '\0')
   48                 d++;
   49         dlen = d - dst;
   50         n = siz - dlen;
   51 
   52         if (n == 0)
   53                 return(dlen + strlen(s));
   54         while (*s != '\0') {
   55                 if (n != 1) {
   56                         *d++ = *s;
   57                         n--;
   58                 }
   59                 s++;
   60         }
   61         *d = '\0';
   62 
   63         return(dlen + (s - src));       /* count does not include NUL */
   64 }

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/strlcat.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/strlcat.c